Newbie needs help with alarm pull hook removal

Hi-
I have this old Autocall alarm that I’d like to give a fresh coat of paint. I’m having trouble removing the pull hook. I was able to remove the little pin in the fastener, but still NOTHING budges…any suggestions. The image below shows an example of what I’m struggling with.[Vintage Original Autocall Company Shelby Ohio FIRE ALARM Box Collectible Display | #1900994767] [Vintage Original Autocall Company Shelby Ohio FIRE ALARM Box Collectible Display | #1900994767]

Try adding some WD-40 and pull on it.